Pulley.



L. WHITGOMB; PULLEYn APPLIOATSONVIILED 1330.28. 1908.

' Patented May 18, 1909.

2 SHEETS-SHEET 1.

LAWRENCE WHITtOhllB, OF BROOKLINE, MASSMTHUSIJTTS, SSIGNOR TO NiillONi-tl, BRAKE AND CLUTCH COMPANY, 01 BOSTON, LIA-BEACHlf'SET'lS. (,TOBPORATION.

r tr o nrrrrri or .LL in on its a r-i U or in nic r/rims PULLEY cameo.

Application filed December 26, 1908.

cone. a citizen of the United States, resid-' ing in llrookline, county of Norfolk, and State of lilassachusetts, have invented an Improvement in Pulleys, of which the lollowing description, in connection with. the accompanying drawings, is *a specification, like characters on the drawings representing like parts.

This invention relates to a device having a thin metal rim and is herein shown as embodied in a pulley having its rim and preferably also its spokes and hub made of steel, and has for its object to increase the trio tional etiiciency o'l the same. For, this pun pose, the steel rim is provided with a series of holes or openings extended lllI'Qrlflll it and into which are inserted pieces or inserts of cork of greater thickness than the said rim and which are extended into sockets, depresi sions or cavities formed in a substantially thin metal backing; strip or plate which is riveted or otl'ierwise secured to the inner circumference of thesteel rim.

The backing strip or plate may be secured lo the steel rim in the manufactu e of the pulley or it may be secured thereto after the pulley has been nnide.

'lhese and other features oi this invention will be pointed out in the claims at the end oi this specification.

-ure 1 is a'side elevation with parts broken away of a steel pulley embodying t-his nvention. l i'g. a crosssection on the line 22, Fig. 1. Fig. 3, a. detail of a portion ot the rim of the pulle shown in Fig. 1, and Figs. t and 5, modifications to he refer ed to.

her rim, Z the spokes or arms and c the hub oi an all steel pulley, of wellknown construction. I

:ln pulleys oi the class described, the rim is made of substantially thin rolled or pressed steel to obtain lightness, strength and rigidity capable of resisting the compreson and other strains incident to itsuse for :rwnsmitti g power.

'ithe present, invention has for its object to provide the pulley with means cooperating with the thin steel rii-na so as to enable the latter to be provided with inserts (Z of cork, whereby the frictional cliiciencyot the pulcii'ring to the drawing, a rc n'esents the.

Specification of Letters Patent.

Patented May 18, 1909.

Serial No. 469,865.

lty

the steel rim or, which is too thin in itscll' to retain the cork inserts, has secured to its inner circumference a light thin backing piece,

strip or section 6 of metal, preteral'ily steel,

which bent or shaped to form rcce 1cs, depressions or sockets j, which prO ect beyond the plane of the strip and are of suiticient depth toreceive and hold the portions of the cork inserts 0 which project through openings or holes f/ in the rim.

The metal backing, strip or plate 6 may be secured to the rim by rivets /z, which are employed to fasten the rim u to the spokes or arms I), or it may be othe 'wise secured to said rim, and the sockets or depressions f may be 'circular in shape and preferably slightly tapering and larger then the holes in the rim a so that'the portion of the cork inserts in the sockets f may expand under the rim a and form locking projections which serve to lock the cork inserts in the holes in the rim (see Fig. 2).

T 1e backing strip or piece eniay be provided with sockets or depressions f of circular form and one for each hole or opening 7 in the steel rim, or said sockets or depressions may be made. of other shapes and of a length to register with a plnralit; oi holes or openings g, utter the manner represented in Figs. 4- and I), wherein the backing strip (2 is shown as provided with a socket or de n'ession j. which is made or" substantially the widthot the strip and-oi the rim a and receives the projecting! ends ol a plurality of cork inserts.

The pulley shown in Fig. 1, is made in, two halves, which are secured together by suitable bolts 16 and the-backing strip 6 may be made of a length equal to the length or the rim of each half, but it is not desired to limit theinvention in this respect as the hacking strip may be composed of a plurality of pieces or sections which are riveted or otherwise secured to the rim of the pol ley. The backing strip also serves to reiir force and strengthen the rim and thereby compensate for any loss of strength whicl'i might be occasioned by drilling or otherwise forming a large number of the holes or openings 9 in the rim 0 The reinforcing or backing strip may be applied to the pul ley when the latter is built up or it may be applied to the rim of acompletedpulley,

may be greatly increased. To this end,

thereby enabling steel pulleys now in use to have their frictional efficiency greatly increased at a minimumcost.

The invention is herein shown as embodied in a pulley, but it is not desired to limit the inventionin this respect as the same may be embodied in a section of the steel rim and used as a clutch or brake band or strap.

1. The combination with a pulley having a thin rim ofsteel provided with holes or openings extended through it, of cork inserts extended through said holes or openings and projecting beyond the inner circumference of said rim, and a metal backing strip or piece secured to the said rim and having portions in diii'erent planes to form a depression, cavity or socket in line with a hole or opening in the said rim and pro-f jecting beyond the plane of the portion of the strip which is secured to'the said rim to receive the projecting portion of a cork insert, substantially as described.

2. The combination with a thin strip or band of steel provided with holes or openings extended through it, of cork inserts extended through said holes .or openings and projecting beyond the inner surface of said secured to the inner surface of said band-or strip and provided with portions in dilfer ent planes to form a depression, cavity or socket projecting beyond the plane of the portion of the strip which is secured to said rii-n for the reception of the projecting portion of a cork insert, substantially as described.

I 3. The combination with a metal pulley having a thin rim provided with holes or openings extendedthrough it, of cork inserts extended through said holes or openings and projecting beyond the inner surband, and a metal backing stripor piece" in line with the holes or openings in the said rim and projecting beyond the plane of the portion of the strip which is secured to said rim for the reception of the projecting por tions of said cork inserts, substantially as described.

4. The combination with a thin metal band or strip provided with holes or openings through, it, of cork insertsextended through said holes or openings and project-4 ing'beyond one surface of saidband or strip, v

a thin metal strip or plate secured to the said band or strip and having po'rtions in differs cavity or ent planes to form a depression, socket in line with-the opening i he band and projecting beyond the plane 0 the p ortion of said strip which is secured to said rim for the reception of the projecting portion of thellcork-insert, substantially as described.

5;. 'Ihe combination with a thin metal band or strip provided with holes or openings-through it, of cork inserts extended through said holes or openings and projecting beyond one surface of said band or strip,

a thin metalstrip or plate secured to the said band or strip and having portions in different planes to form a depression, cavity or socket in line-with the opening in the band and projecting beyond the-plane of the.

portion of said strip which is secured to the said rim for the reception of the projecting portion of thecork insert, said depression, cavity or socket having a portion of greater width than, the opening with which it cooperates to permit the cork insert to expand beyond the opening in said band or strip and form a looking as described.

In testimony whereof, I have signed my name to this specification in the presence of two subscribingwitnesses.

LAWRENCE wHrrooMB.

Witnesses:

JA's. H. CHURCHILL,

J MURPHY.

projection, substantially 

